How to use the online alarm clock
Waking at 3:40 am gives you a quiet moment to get ready before finishing a shift at a 24-hour supermarket. You have not started moving yet, so allow time to sit up, dress and gather what you need before leaving. With 20 minutes until 4:00 am, there is enough space to become properly alert without making the start feel rushed.
A supermarket shift can involve refrigeration units, stock cages and cleaning equipment, so set the alarm loud enough to be heard above the background noise around you. Test the signal at the same volume beforehand and keep the speaker unobstructed rather than tucked beneath bedding. If the browser alarm stops running while you sleep, it cannot sound to prepare you for the supermarket shift, so use a separate alarm as a safeguard when being on time matters.
Before sleeping ahead of this early start, arrange the light you will use when the 3:40 am alarm sounds. Leave a bedside lamp within easy reach or set a timed light to come on gently, while keeping the room dark enough beforehand for the night to feel undisturbed. Avoid relying on the bright main light immediately; a smaller lamp lets you see your clothes and belongings without fumbling, then you can increase the lighting once you are upright.
Common questions
Do I need an account or an app?
Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.
Can I change the sound?
Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.
Will it still be right when the clocks change?
Yes. It reads your device's local clock, so the move between GMT and BST at the end of March and October is picked up automatically, as long as the computer's date, time and time zone are set correctly.
Can I use this on a phone?
It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.
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